Method of compensating display device

Abstract

A method of compensating a display device includes: displaying a first display image of a calibration pattern; generating a first photograph image of the calibration pattern by capturing the first display image; generating a measurement representative position data corresponding to the calibration pattern by measuring the first photograph image; generating a third-order fitting representative position data by performing a two-dimensional third-order fitting; displaying a second display image of a full white display; generating a second photograph image of the full white display by capturing the second display image; generating a first crop image by performing a size adjustment based on the third-order fitting representative position data; calculating a luminance compensation value by comparing a measured luminance of the first crop image with a target luminance; and generating a compensated image data by applying the luminance compensation value to an image data.

What is claimed is: 
     
       1. A method of compensating a display device, comprising:
 displaying a first display image of a calibration pattern using a display device, the display device including a plurality of display subpixels; 
 generating a first photograph image of the calibration pattern by capturing the first display image using a camera, the camera including a plurality of sensor subpixels; 
 generating a measurement representative position data corresponding to the calibration pattern by measuring the first photograph image; 
 generating a third-order fitting representative position data by performing a two-dimensional third-order fitting for the measurement representative position data; 
 displaying a second display image of a full white display using the display device; 
 generating a second photograph image of the full white display by capturing the second display image using the camera; 
 generating a first crop image by performing a first size adjustment of the second photograph image based on the third-order fitting representative position data; 
 calculating a luminance compensation value by comparing a measured luminance of the first crop image with a target luminance; and 
 generating a compensated image data by applying the luminance compensation value to an image data. 
 
     
     
       2. The method of  claim 1 , wherein a fitting surface according to an x-axis and a y-axis of the two-dimensional third-order fitting is expressed by a following equation:
   fitting surface( x,y ) =p 00+ p 10 *x+p 01 *y+p 20 *x   2   +p 11 *xy+p 02 *y   2   +p 30 *x   3   +p 21 *x   2   y+p 12 *xy   2   +p 03 *y   3 , 
 wherein p00 is a zeroth-order fitting coefficient, p10 and p01 are first-order fitting coefficients, p20, p11, and p02 are second-order fitting coefficients, and p30, p21, p12, and p03 are third-order fitting coefficients. 
 
     
     
       3. The method of  claim 1 , wherein the first display image of the calibration pattern includes a plurality of blocks along a x-axis and a y-axis, and
 wherein each of the plurality of blocks includes one emission display subpixel and a plurality of non-emission display subpixels. 
 
     
     
       4. The method of  claim 3 , further comprising:
 generating an entire position data by dividing a distance between the third-order fitting representative position data corresponding to an emission display subpixel of two adjacent blocks from the plurality of blocks with an equal interval. 
 
     
     
       5. The method of  claim 1 , further comprising:
 displaying a third display image of a partial point using the display device; 
 generating a third photograph image of the partial point by capturing the third display image using the camera; and 
 calculating an optimum shift value by performing a shifting for the third photograph image. 
 
     
     
       6. The method of  claim 5 , wherein calculating the optimum shift value comprises:
 generating a second crop image by adding a first shift value to coordinates of a center of the partial point of the third photograph image and performing a second size adjustment of the third photograph image; 
 calculating a first total symmetry value by performing a symmetry calculation of the partial point of the second crop image; 
 calculating a plurality of total symmetry values that are different from the first total symmetry value by iterating the second size adjustment and the symmetry calculation using a plurality of shift values that are different from the first shift value; and 
 setting a greatest value among the first total symmetry value and the plurality of total symmetry values as the optimum shift value. 
 
     
     
       7. The method of  claim 6 , wherein the partial point of the second crop image includes a first crop subpixel to ninth crop subpixel arranged as three rows and three columns, and calculating the first total symmetry value comprises:
 calculating a first average of a first ratio of a luminance minimum value of the first crop subpixel and the third crop subpixel with respect to a luminance maximum value of the first crop subpixel and the third crop subpixel, a second ratio of a luminance minimum value of the fourth crop subpixel and the sixth crop subpixel with respect to a luminance maximum value of the fourth crop subpixel and the sixth crop subpixel, and a third ratio of a luminance minimum value of the seventh crop subpixel and the ninth crop subpixel with respect to a luminance maximum value of the seventh crop subpixel and the ninth crop subpixel as a left-right symmetry value; 
 calculating a second average of a fourth ratio of a luminance minimum value of the first crop subpixel and the seventh crop subpixel with respect to a luminance maximum value of the first crop subpixel and the seventh crop subpixel, a fifth ratio of a luminance minimum value of the second crop subpixel and the eighth crop subpixel with respect to a luminance maximum value of the second crop subpixel and the eighth crop subpixel and a sixth ratio of a luminance minimum value of the third crop subpixel and the ninth crop subpixel with respect to a luminance maximum value of the third crop subpixel and the ninth crop subpixel as an up-down symmetry value; and 
 calculating an average value of the left-right symmetry value and the up-down symmetry value as the first total symmetry value. 
 
     
     
       8. The method of  claim 6 , wherein the second crop image includes a red crop subpixel, a green crop subpixel, and a blue crop subpixel,
 wherein the second size adjustment and the symmetry calculation are iterated for the green crop subpixel using the first shift value and the plurality of shift values within a range of −1.0 to +1.0, and 
 wherein the second size adjustment and the symmetry calculation are iterated for the blue crop subpixel and the red crop subpixel using the first shift value and the plurality of shift values within a range of −2.0 to +2.0. 
 
     
     
       9. A method of compensating a display device, comprising:
 displaying a first display image of a calibration pattern using a display device, the display device including a plurality of display subpixels; 
 generating a first photograph image of the calibration pattern by capturing the first display image using a camera, the camera including a plurality of sensor subpixels; 
 generating a first measurement representative position data corresponding to the calibration pattern by measuring the first photograph image; 
 displaying a second display image of a partial point using the display device; 
 generating a second photograph image of the partial point by capturing the second display image using the camera; 
 generating a second measurement representative position data by measuring the second photograph image; 
 calculating an optimum shift value by performing a shifting for the second photograph image; 
 generating a shifting representative position data by adding the optimum shift value to the second measurement representative position data; 
 displaying a third display image of a full white display using the display device; 
 generating a third photograph image of the full white display by capturing the third display image using the camera; 
 generating a first crop image by performing a size adjustment of the third photograph image based on the shifting representative position data; 
 calculating a luminance compensation value by comparing a measured luminance of the first crop image with a target luminance; and 
 generating a compensated image data by applying the luminance compensation value to an image data.